Oh what great point Mr.Dinesh. We dont know that. Most of them came from the United States.No matter how you twist and turn US has its place in science and technology. No doubt you are a Communist, No use of talking .cuz you are brain washed by Mao, lennin , murdered Stalin and Marx books. No way you gonna think out of their philosophy. Would you like to live in China, Cuba , or North Korea? Do they have some thing called "Human rights"? Do they know the meaning of it? Thats your communism.